Handyandyuk,
Luckily the guy doing my LPC had enough of a sense of humour to just take the p*ss out of me and put it down to first-LPC-nerves. It gave me a nice warm feeling to watch someone else do it a year or so later when about to fly with the helicopter's owner though...
Have you noticed the more embarassing the error, the less likely you are to do it again? They shall remain nameless, but a couple of acquaintances once flew to a nearby airfield with the ground handling wheels still attached to the R22...